Metal Hybrid PPTC device offers smart activation feature
February 28, 2012 // Paul Buckley
TE Circuit Protection, a business unit of TE Connectivity, has introduced a Metal Hybrid PPTC (MHP) device offering Smart Activation (SA) functionality. The MHP-SA device provides a resettable, cost-effective and space-saving alternative to typical methods of protecting high-power lithium battery and module applications.
The applications include cordless power tools, e-scooters and light electric vehicles (LEVs) and standby power and energy storage systems (ESSs).
The MHP-SA device helps provide overcharge protection in large multi-cell battery packs and modules in which circuit protection devices interface with electronics as part of a sophisticated battery management system. It's Smart Activation design feature accomplishes this via a third terminal signal line that enables external activation.
In a typical scenario, an IC monitors the battery system's temperature, current and voltage and, if an abnormality is detected, it switches on a FET and activates the heater element (PPTC) of the MHP-SA device to heat the bimetal. The bimetal contacts then open and cut contact to the main line. The first in a series of planned devices, the MHP-SA50-400-M5 device has a 50-A/400-VDC maximum rating and its hold current is 50 A on the main line. The device can be activated electronically with as little as 3 A via the signal line.
MHP technology utilizes a hybrid circuit protection approach, combining a bimetal protector in parallel with a polymeric positive temperature coefficient (PPTC) device. Resettable MHP technology offers excellent arc suppression characteristics and also offers a smaller size and thinner form factor compared to larger DC fuses or other protection devices.
The MHP-SA device helps save design costs due to its ability to employ a low-power switch to open the main line, enabling lower-cost FETs to be installed. And because the MHP-SA device is resettable there is no need to overrate for inrush currents. In some cases, designers can replace larger, higher-cost DC fuses with an MHP-SA device.
“Few protection solutions address high-rate-discharge battery applications, and traditional circuit protection techniques tend to be large, complex and/or expensive,” said Ty Bowman, TE Circuit Protection Global Battery Market Manager. “The MHP-SA device offers design benefits in multi-cell battery packs that conventional circuit protection approaches are unable to deliver. The MHP-SA device provides a rugged, resettable overcharge protection solution that offers battery pack designers and manufacturers a way to optimize space, reduce cost, enhance safety and help meet future battery safety requirements.”
Beyond programmability: full design observability at runtime
October 01, 2014
After the successful launch of two generations of ABAX general-purpose 3D programmable logic devices (3PLDs) based on its ...
Nikola Tesla's lab could speak to future generations
Macronix rolls out European expansion plan
Intel leads non-iPad tablet processor market
Could low-power 3D nanomagnetic logic replace transistors?
Oscilloscope engine plugs into portable Apple products
September 30, 2014
This month, Oscium is giving away three of its iMSO-204L dual analogue iOS oscilloscopes, worth USD400 each. Designed with ...
BMW joins forces with Baidu for automated driving
Self-tuning acoustic-ready chip increases audio focus
16nm FinFETs boost ARM's 64-bit big.LITTLE
- Solutions for Millimeter Wave Wireless Backhaul
- Enter Linduino
- A Novel Approach to Industrial Rectifier Systems
- Putting FPGAs to Work in Software Radio Systems Handbook
InterviewCEO interview: AMS' Laney on driving a sensor-driven business
Kirk Laney, CEO of Austrian mixed-signal chip and sensor company AMS, wants to leverage the opportunity that technology affords to create new markets for sensors and sensor interfaces.
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Oscium is giving away three of its iMSO-204L dual analogue iOS oscilloscopes, worth USD400 each. Designed with native Lightning compatibility, the iMSO-204L transforms the iPad, iPhone, and iPod touch into an ultra-portable, two-channel oscilloscope.
Since Apple changed its connector, Oscium has been working to bring native compatibility to its customers. The third generation...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.